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From YAHOO to YUI() Sandboxed App Development Your own protected YUI environment Ability to reach out to other instances if required Future: Explicit Versioning support YAHOO var Y = YUI() new YAHOO.util.Anim() new Y.Anim()

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Custom Events: Now With Flavor Crystals! Event Facades Built-in on and after moments Default Behavior (preventDefault) Event Bubbling (stopPropagation) Detach Handles The Enhanced Custom Event System Is An Integral Part of YUI 3’s Goal To Be Lighter, Allowing For Highly Decoupled Code

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A Common Component Foundation Y.Base "this.constructor.superestclass" The Class From Which YUI 3 Classes Will Be Derived Combines Custom Event And Attribute Support Manages the "init" and "destroy" Lifecycle Moments Provides Plugin/Extension Management